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guide bar nose:WS bar nose,ST bar nose,OR bar nose,DLD bar nose,SV bar nose,GB bar nose(GB375),harvester bar nose Hangzhou Longer saw chain Co.Ltd is specialized in dealing with many kinds of saw chains.We trade with some company oversea, like professional garden tools and accessories company, or large purchasing company. Our product orientation is up-market, competing with brands of international famous.The raw materials of our products are imported from America, which shares the same origin of materials with OREGON. And the type of the materials is SAE8660.Heat treatment is handed in Kunshan Xinguang Heat Treatment Factory which is an expertise company of Taiwanese capital.The inspection procedure: We have the expert inspection group to check the saw chains and its components. These inspections include test for pre-tensile strength, test for stability and breaking, test for the hardness of its components, test for breaking of finished products, the quality of saw chain surface, test for flexibility of saw chains and so on.Stability and breaking strength of our products:Specificationtest for tensile strengthOREGONSTIHLLONGER3/8″LP5650-58505655-57905600-5850.325″7400-75607410-75707280-74603/8″7650-78007650-79007600-8600.404″10560-1078010565-1080010460-10630Chain saw type:PITCHGAUGECHAIN TYPEA=3/8”LP0=.043”/1.1mmFT=SafetyB=.325”1=.050”/1.3mmS=Square-cornerC=3/8”2=.058”/1.5mmT=tight toothD=.404”3=.063”/1.6mmST=Skip toothE=1/4”4=.080”/2.0mmG=3/4”5=.122”Cutter hardness of blade:HRChard chromium platingTimesLONGERLONGER155.5464255.7663.52354.9163.27456.1763.87As the descriptionis theproducts'basic information above all, the quality of our productsworth your trust. We expect to establish business relationship with you.